S21SEC [DCS17CTF] – Namibia

During my spare time i have tried some tasks from DSC17 CTF by S21sec. I will comment here on those in which I found more difficult or fun. FBCTF was present as platform so from here tasks names will be countries associated.

Namibia – 450 points

SREC Motorola Firmware

We can learn a lot from ctf tasks. Indeed there is a lot of encoding’s format like Motorola SREC. Basically encodes a header, data, indexes that points program execution, etc …

Task is asking us about serial number of local SSL web administrative page. So, if i’m not wrong, inside that file must be present a web server with some cert.pem file. First step is dump a binary file from srec format. We can use python library “bincopy”. There is another tools on Internet related to srec format for several srec’s types, but for me python works.